Discharge tube: a closed insulating vessel containing a gas at low pressure through which an electric current flows when sufficient voltage is applied to its electrodes.
放电管：装有低压气体的封闭绝缘容器，当电极有足够的电压时，通过它电流就开始流动。
2
A spark discharge between two electrodes produces an "ionised gas tube" in the xenon gas-filled lamp piston through which electric current flows which in turn causes the gas to light up.
Some new results are given through investigation on threshold feature of the laser, effect of gas mixture ratio and discharge temperature on the laser output power etc.